Cool, whats sort of FPS is it? I literally know nothing about it, is it story driven or simple A-B stuff?
Both really. There's a strong (not necessarily sensical) back story and environment unpinning it all, but I suppose yes, it is really just A-B stuff. It throws in quite a few stealth sections that are a nice variation and when you finally hit the surface the gas mask mechanic adds a lot of tension.
Don't think I've played enough different FPS since the 360 launch to prevent a top 10 list just being the 10 different ones I've played, so to be a rebel I'm listing my top 10 all-formats of all time, in no particular order:
Duke 3D
Doom II
Blood
GoldenEye
Perfect Dark
Halo 2*
MoH Alllied Assault
UT
L4D
Timesplitters 2
*obviously 3's better but the jump from local / LAN only mp in CE to 2's online glory was just phenomenal.